C. O. P. D. , chronic obstructive pulmonary disease, blocks airflow through the lungs. It makes breathing difficult.
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it makes breathing difficult
使呼吸困难
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It makes breathing difficult. The leading cause is cigarette smoking.
VOA: special.2009.06.23
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